Instrumentation
The symphony requires an instrumentation of one pair each of flutes, oboes, clarinets, bassoons, with four horns, three trumpets, three trombones, timpani and strings. From the 1878 revision onwards, a single bass tuba is also incorporated into the instrumentation. The published score of 1889 introduces a part for third flute (doubling on the piccolo) and a pair of cymbals.
Read more about this topic: Symphony No. 4 (Bruckner)